/*      $OpenBSD: getopt_long.c,v 1.20 2005/10/25 15:49:37 jmc Exp $    */
/*      $NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $      */
// Adapted for Box Backup by Chris Wilson <chris+boxbackup@qwirx.com>

/*
 * Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */
/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Dieter Baron and Thomas Klausner.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

// #include "Box.h"

#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define __STDC__ 1

#include "getopt.h"

#if defined _MSC_VER || defined __MINGW32__
#define REPLACE_GETOPT          /* use this getopt as the system getopt(3) */

#ifdef REPLACE_GETOPT
int     opterr = 1;             /* if error message should be printed */
int     optind = 1;             /* index into parent argv vector */
int     optopt = '?';           /* character checked for validity */
int     optreset;               /* reset getopt */
char    *optarg;                /* argument associated with option */
#endif

#define PRINT_ERROR     ((opterr) && (*options != ':'))

#define FLAG_PERMUTE    0x01    /* permute non-options to the end of argv */
#define FLAG_ALLARGS    0x02    /* treat non-options as args to option "-1" */
#define FLAG_LONGONLY   0x04    /* operate as getopt_long_only */

/* return values */
#define BADCH           (int)'?'
#define BADARG          ((*options == ':') ? (int)':' : (int)'?')
#define INORDER         (int)1

#define EMSG            ""

static void warnx(const char* fmt, ...)
{
        va_list ap;
        va_start(ap, fmt);
        vfprintf(stderr, fmt, ap);
        va_end(ap);
	        fprintf(stderr, "\n");
	}
	
	static int getopt_internal(int, char * const *, const char *,
	                           const struct option *, int *, int);
	static int parse_long_options(char * const *, const char *,
	                              const struct option *, int *, int);
	static int gcd(int, int);
	static void permute_args(int, int, int, char * const *);
	
	static char *place = EMSG; /* option letter processing */
	
	/* XXX: set optreset to 1 rather than these two */
	static int nonopt_start = -1; /* first non option argument (for permute) */
	static int nonopt_end = -1;   /* first option after non options (for permute) */
	
	/* Error messages */
	static const char recargchar[] = "option requires an argument -- %c";
	static const char recargstring[] = "option requires an argument -- %s";
	static const char ambig[] = "ambiguous option -- %.*s";
	static const char noarg[] = "option doesn't take an argument -- %.*s";
	static const char illoptchar[] = "unknown option -- %c";
	static const char illoptstring[] = "unknown option -- %s";
	
	/*
	 * Compute the greatest common divisor of a and b.
	 */
	static int
	gcd(int a, int b)
	{
	        int c;
	
	        c = a % b;
	        while (c != 0) {
	                a = b;
	                b = c;
	                c = a % b;
	        }
	
	        return (b);
	}
	
	/*
	 * Exchange the block from nonopt_start to nonopt_end with the block
	 * from nonopt_end to opt_end (keeping the same order of arguments
	 * in each block).
	 */
	static void
	permute_args(int panonopt_start, int panonopt_end, int opt_end,
	        char * const *nargv)
	{
	        int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
	        char *swap;
	
	        /*
	         * compute lengths of blocks and number and size of cycles
	         */
	        nnonopts = panonopt_end - panonopt_start;
	        nopts = opt_end - panonopt_end;
	        ncycle = gcd(nnonopts, nopts);
	        cyclelen = (opt_end - panonopt_start) / ncycle;
	
	        for (i = 0; i < ncycle; i++) {
	                cstart = panonopt_end+i;
	                pos = cstart;
	                for (j = 0; j < cyclelen; j++) {
	                        if (pos >= panonopt_end)
	                                pos -= nnonopts;
	                        else
	                                pos += nopts;
	                        swap = nargv[pos];
	                        /* LINTED const cast */
	                        ((char **) nargv)[pos] = nargv[cstart];
	                        /* LINTED const cast */
	                        ((char **)nargv)[cstart] = swap;
	                }
	        }
	}
	
	/*
	 * parse_long_options --
	 *      Parse long options in argc/argv argument vector.
	 * Returns -1 if short_too is set and the option does not match long_options.
	 */
	static int
	parse_long_options(char * const *nargv, const char *options,
	        const struct option *long_options, int *idx, int short_too)
	{
	        char *current_argv, *has_equal;
	        size_t current_argv_len;
	        int i, match;
	
	        current_argv = place;
	        match = -1;
	
	        optind++;
	
	        if ((has_equal = strchr(current_argv, '=')) != NULL) {
	                /* argument found (--option=arg) */
	                current_argv_len = has_equal - current_argv;
	                has_equal++;
	        } else
	                current_argv_len = strlen(current_argv);
	
	        for (i = 0; long_options[i].name; i++) {
	                /* find matching long option */
	                if (strncmp(current_argv, long_options[i].name,
	                    current_argv_len))
	                        continue;
	
	                if (strlen(long_options[i].name) == current_argv_len) {
	                        /* exact match */
	                        match = i;
	                        break;
	                }
	                /*
	                 * If this is a known short option, don't allow
	                 * a partial match of a single character.
	                 */
	                if (short_too && current_argv_len == 1)
	                        continue;
	
	                if (match == -1)        /* partial match */
	                        match = i;
	                else {
	                        /* ambiguous abbreviation */
	                        if (PRINT_ERROR)
	                                warnx(ambig, (int)current_argv_len,
	                                     current_argv);
	                        optopt = 0;
	                        return (BADCH);
	                }
	        }
	        if (match != -1) {              /* option found */
	                if (long_options[match].has_arg == no_argument
	                    && has_equal) {
	                        if (PRINT_ERROR)
	                                warnx(noarg, (int)current_argv_len,
	                                     current_argv);
	                        /*
	                         * XXX: GNU sets optopt to val regardless of flag
	                         */
	                        if (long_options[match].flag == NULL)
	                                optopt = long_options[match].val;
	                        else
	                                optopt = 0;
	                        return (BADARG);
	                }
	                if (long_options[match].has_arg == required_argument ||
	                    long_options[match].has_arg == optional_argument) {
	                        if (has_equal)
	                                optarg = has_equal;
	                        else if (long_options[match].has_arg ==
	                            required_argument) {
	                                /*
	                                 * optional argument doesn't use next nargv
	                                 */
	                                optarg = nargv[optind++];
	                        }
	                }
	                if ((long_options[match].has_arg == required_argument)
	                    && (optarg == NULL)) {
	                        /*
	                         * Missing argument; leading ':' indicates no error
	                         * should be generated.
	                         */
	                        if (PRINT_ERROR)
	                                warnx(recargstring,
	                                    current_argv);
	                        /*
	                         * XXX: GNU sets optopt to val regardless of flag
	                         */
	                        if (long_options[match].flag == NULL)
	                                optopt = long_options[match].val;
	                        else
	                                optopt = 0;
	                        --optind;
	                        return (BADARG);
	                }
	        } else {                        /* unknown option */
	                if (short_too) {
	                        --optind;
	                        return (-1);
	                }
	                if (PRINT_ERROR)
	                        warnx(illoptstring, current_argv);
	                optopt = 0;
	                return (BADCH);
	        }
	        if (idx)
	                *idx = match;
	        if (long_options[match].flag) {
	                *long_options[match].flag = long_options[match].val;
	                return (0);
	        } else
	                return (long_options[match].val);
	}
	
	/*
	 * getopt_internal --
	 *      Parse argc/argv argument vector.  Called by user level routines.
	 */
	static int
	getopt_internal(int nargc, char * const *nargv, const char *options,
	        const struct option *long_options, int *idx, int flags)
	{
	        const char * oli; /* option letter list index */
	        int optchar, short_too;
	        static int posixly_correct = -1;
	
	        if (options == NULL)
	                return (-1);
	
	        /*
	         * Disable GNU extensions if POSIXLY_CORRECT is set or options
	         * string begins with a '+'.
	         */
	        if (posixly_correct == -1)
	                posixly_correct = (getenv("POSIXLY_CORRECT") != NULL);
	        if (posixly_correct || *options == '+')
	                flags &= ~FLAG_PERMUTE;
	        else if (*options == '-')
	                flags |= FLAG_ALLARGS;
	        if (*options == '+' || *options == '-')
	                options++;
	
	        /*
	         * XXX Some GNU programs (like cvs) set optind to 0 instead of
	         * XXX using optreset.  Work around this braindamage.
	         */
	        if (optind == 0)
	                optind = optreset = 1;
	
	        optarg = NULL;
	        if (optreset)
	                nonopt_start = nonopt_end = -1;
	start:
	        if (optreset || !*place) {              /* update scanning pointer */
	                optreset = 0;
	                if (optind >= nargc) {          /* end of argument vector */
	                        place = EMSG;
	                        if (nonopt_end != -1) {
	                                /* do permutation, if we have to */
	                                permute_args(nonopt_start, nonopt_end,
	                                    optind, nargv);
	                                optind -= nonopt_end - nonopt_start;
	                        }
	                        else if (nonopt_start != -1) {
	                                /*
	                                 * If we skipped non-options, set optind
	                                 * to the first of them.
	                                 */
	                                optind = nonopt_start;
	                        }
	                        nonopt_start = nonopt_end = -1;
	                        return (-1);
	                }
	                if (*(place = nargv[optind]) != '-' ||
	                    (place[1] == '\0' && strchr(options, '-') == NULL)) {
	                        place = EMSG;           /* found non-option */
	                        if (flags & FLAG_ALLARGS) {
	                                /*
	                                 * GNU extension:
	                                 * return non-option as argument to option 1
	                                 */
	                                optarg = nargv[optind++];
	                                return (INORDER);
	                        }
	                        if (!(flags & FLAG_PERMUTE)) {
	                                /*
	                                 * If no permutation wanted, stop parsing
	                                 * at first non-option.
	                                 */
	                                return (-1);
	                        }
	                        /* do permutation */
	                        if (nonopt_start == -1)
	                                nonopt_start = optind;
	                        else if (nonopt_end != -1) {
	                                permute_args(nonopt_start, nonopt_end,
	                                    optind, nargv);
	                                nonopt_start = optind -
	                                    (nonopt_end - nonopt_start);
	                                nonopt_end = -1;
	                        }
	                        optind++;
	                        /* process next argument */
	                        goto start;
	                }
	                if (nonopt_start != -1 && nonopt_end == -1)
	                        nonopt_end = optind;
	
	                /*
	                 * If we have "-" do nothing, if "--" we are done.
	                 */
	                if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
	                        optind++;
	                        place = EMSG;
	                        /*
	                         * We found an option (--), so if we skipped
	                         * non-options, we have to permute.
	                         */
	                        if (nonopt_end != -1) {
	                                permute_args(nonopt_start, nonopt_end,
	                                    optind, nargv);
	                                optind -= nonopt_end - nonopt_start;
	                        }
	                        nonopt_start = nonopt_end = -1;
	                        return (-1);
	                }
	        }
	
	        /*
	         * Check long options if:
	         *  1) we were passed some
	         *  2) the arg is not just "-"
	         *  3) either the arg starts with -- we are getopt_long_only()
	         */
	        if (long_options != NULL && place != nargv[optind] &&
	            (*place == '-' || (flags & FLAG_LONGONLY))) {
	                short_too = 0;
	                if (*place == '-')
	                        place++;                /* --foo long option */
	                else if (*place != ':' && strchr(options, *place) != NULL)
	                        short_too = 1;          /* could be short option too */
	
	                optchar = parse_long_options(nargv, options, long_options,
	                    idx, short_too);
	                if (optchar != -1) {
	                        place = EMSG;
	                        return (optchar);
	                }
	        }
	
	        if ((optchar = (int)*place++) == (int)':' ||
	            optchar == (int)'-' && *place != '\0' ||
	            (oli = strchr(options, optchar)) == NULL) {
	                /*
	                 * If the user specified "-" and  '-' isn't listed in
	                 * options, return -1 (non-option) as per POSIX.
	                 * Otherwise, it is an unknown option character (or ':').
	                 */
	                if (optchar == (int)'-' && *place == '\0')
	                        return (-1);
	                if (!*place)
	                        ++optind;
	                if (PRINT_ERROR)
	                        warnx(illoptchar, optchar);
	                optopt = optchar;
	                return (BADCH);
	        }
	        if (long_options != NULL && optchar == 'W' && oli[1] == ';') {
	                /* -W long-option */
	                if (*place)                     /* no space */
	                        /* NOTHING */;
	                else if (++optind >= nargc) {   /* no arg */
	                        place = EMSG;
	                        if (PRINT_ERROR)
	                                warnx(recargchar, optchar);
	                        optopt = optchar;
	                        return (BADARG);
	                } else                          /* white space */
	                        place = nargv[optind];
	                optchar = parse_long_options(nargv, options, long_options,
	                    idx, 0);
	                place = EMSG;
	                return (optchar);
	        }
	        if (*++oli != ':') {                    /* doesn't take argument */
	                if (!*place)
	                        ++optind;
	        } else {                                /* takes (optional) argument */
	                optarg = NULL;
	                if (*place)                     /* no white space */
	                        optarg = place;
	                /* XXX: disable test for :: if PC? (GNU doesn't) */
	                else if (oli[1] != ':') {       /* arg not optional */
	                        if (++optind >= nargc) {        /* no arg */
	                                place = EMSG;
	                                if (PRINT_ERROR)
	                                        warnx(recargchar, optchar);
	                                optopt = optchar;
	                                return (BADARG);
	                        } else
	                                optarg = nargv[optind];
	                } else if (!(flags & FLAG_PERMUTE)) {
	                        /*
	                         * If permutation is disabled, we can accept an
	                         * optional arg separated by whitespace so long
	                         * as it does not start with a dash (-).
	                         */
	                        if (optind + 1 < nargc && *nargv[optind + 1] != '-')
	                                optarg = nargv[++optind];
	                }
	                place = EMSG;
	                ++optind;
	        }
	        /* dump back option letter */
	        return (optchar);
	}
	
	#ifdef REPLACE_GETOPT
	/*
	 * getopt --
	 *      Parse argc/argv argument vector.
	 *
	 * [eventually this will replace the BSD getopt]
	 */
	int
	getopt(int nargc, char * const *nargv, const char *options)
	{
	
	        /*
	         * We don't pass FLAG_PERMUTE to getopt_internal() since
	         * the BSD getopt(3) (unlike GNU) has never done this.
	         *
	         * Furthermore, since many privileged programs call getopt()
	         * before dropping privileges it makes sense to keep things
	         * as simple (and bug-free) as possible.
	         */
	        return (getopt_internal(nargc, nargv, options, NULL, NULL, 0));
	}
	#endif /* REPLACE_GETOPT */
	
	/*
	 * getopt_long --
	 *      Parse argc/argv argument vector.
	 */
	int
	getopt_long(int nargc, char * const *nargv, const char *options,
	    const struct option *long_options, int *idx)
	{
	
	        return (getopt_internal(nargc, nargv, options, long_options, idx,
	            FLAG_PERMUTE));
	}
	
	/*
	 * getopt_long_only --
	 *      Parse argc/argv argument vector.
	 */
	int
	getopt_long_only(int nargc, char * const *nargv, const char *options,
	    const struct option *long_options, int *idx)
	{
	
	        return (getopt_internal(nargc, nargv, options, long_options, idx,
	            FLAG_PERMUTE|FLAG_LONGONLY));
	}
	
#endif // defined _MSC_VER || defined __MINGW32__